Transmitting magnetic field through metal chassis using fractal surfaces

ABSTRACT

Described herein are techniques related one or more systems, apparatuses, methods, etc. for reducing induced currents in a apparatus chassis. For example, a fractal slot is constructed in the apparatus chassis to reduce the induced currents, and enhance passage of magnetic fields through the apparatus chassis. In this example, the fractal slot may include a no-self loop fractal space filling curve shape to provide high impedance to the induced currents.

RELATED APPLICATION

This application claims the benefit of priority of U.S. ProvisionalPatent Application Ser. No. 61/667,518 filed Jul. 3, 2012.

BACKGROUND

Recently, technologies have arisen that allow near field coupling (e.g.,wireless power transfers (WPT) and near field communications (NFC))between portable devices in close proximity to each other. Such nearfield coupling functions may use radio frequency (RF) antennas in thedevices to transmit and receive electromagnetic signals. Because of userdesires (and/or for esthetic reasons) many of these portable devices aresmall (and becoming smaller), and tend to have exaggerated aspect ratioswhen viewed from the side. As a result, many of these portable devicesincorporate flat antennas, which use coils of conductive material astheir radiating antennas for use in near field coupling functions.

For example, an NFC antenna integration in a plastic chassis portabledevice may be achieved by creating a cutout on a conductiveelectromagnetic interference (EMI) coating under a palm rest area of theportable device, such that the NFC antenna that is attached to thecutout area may radiate through the chassis effectively. For deviceshaving a complete metallic chassis, the metallic chassis is often usedto maintain mechanical strength in a thin design. The use of themetallic chassis creates a key challenge for NFC coil antennaintegration into such devices (e.g., thin laptop computer such asUltrabooks), since the NFC antenna needs a non-metallic surface in orderto radiate through.

Accordingly, a solution allowing the NFC antenna to be integrated into athin metallic chassis and maintain efficiency in the NFC antennaradiation is desired so that industrial design, mechanical integrity,and customer appeal may be preserved.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 illustrates wireless devices in an example near field couplingarrangement.

FIGS. 2A and 2B illustrate an example near field communications (NFC)coil antenna and top view of a keypad area in a wireless device,respectively.

FIG. 3 illustrates an example underneath view of a coil antenna and aconductive surface of a conductive coating.

FIG. 4A illustrates an example first order, second order, etc. of afractal curve that is used as a template for constructing a fractal slotin a conductive coating and a metallic chassis.

FIG. 4B illustrates an example fractal slot placed in differentquadrants of an area of a near field communications (NFC) coil antenna.

FIG. 5 illustrates alternate fractal space filling curves that avoidself loop to minimize Eddy current paths.

FIG. 6 is an example method to reduce induced currents in a wirelessdevice chassis.

FIG. 7 illustrates an example system device to implement near fieldcommunications (NFC) related functions.

FIG. 8 illustrates an example device to implement near fieldcommunications (NFC) related functions.

The following Detailed Description is provided with reference to theaccompanying figures. In the figures, the left-most digit(s) of areference number usually identifies the figure in which the referencenumber first appears. The use of the same reference numbers in differentfigures indicates similar or identical items.

DETAILED DESCRIPTION

This document discloses one or more systems, apparatuses, methods, etc.for reducing induced currents in a wireless device chassis such as, in apalm rest of a full metal chassis portable device (e.g., Ultrabook). Inan implementation, a near field communications (NFC) coil antenna may beintegrated underneath the full metal chassis and conductive coating ofthe portable device. In this implementation, the full metal chassistogether with the conductive coating may be configured to utilize aspecial slot pattern or design in reducing the current (e.g., Eddycurrent) that may be induced by electromagnetic fields radiated by theNFC coil antenna. For example, the special slot pattern or design mayinclude at least one fractal slot or surface that adapts a no-self loopfractal space filling curve shape to minimize path or cut continuity ofthe Eddy current.

In an implementation, the fractal slot may provide high impedance to theEddy current using its own unique configuration (i.e., no-self loopfractal space filling curve shape), or by adjusting slot width (e.g.,one mm) to minimize coupling between the NFC coil antenna and themetallic chassis and/or the conductive coating. In this implementation,the minimized coupling may denote a minimized Eddy current. In anotherimplementation, direction of sliced slots or segments in the fractalslot is configured to be perpendicular to an assumed direction of theEddy current. Furthermore, the fractal slot may be designed to befrequency selective when the NFC coil antenna is used for wirelessfidelity (WiFi) signals by adjusting the slot width and/or geometricpattern of the fractal slot.

In an implementation, the fractal slot is tiled to another fractal slotin providing the high impedance to the Eddy current. Furthermore,grounding each of the tiled fractal slots may increase electrostaticdischarge (ESD) protection in the conductive coating or the portabledevice.

FIG. 1 illustrates an example arrangement 100 of portable devices fornear field coupling. More particularly, users may have a desire tooperate near field coupling enabled portable electronic devices and/orother devices in certain ergonomically convenient manners. Examples ofsuch portable devices include, but are not limited to, ultrabooks, atablet computer, a netbook, a notebook computer, a laptop computer,mobile phone, a cellular phone, a smartphone, a personal digitalassistant, a multimedia playback device, a digital music player, adigital video player, a navigational device, a digital camera, and thelike.

In an implementation, FIG. 1 shows two users (not shown) that operatetheir NFC-enabled portable devices 102-2 and 102-4 to performNFC-related information sharing functions. For example, a front-to-back(not shown), or a back-to-back (not shown) manner may be performed forthe NFC communication. In an implementation, the portable devices 102may accept information from a credit card 104, a NFC tag 106 (or othersimilar device) through a NFC coil antenna (not shown). The portabledevices 102 may require the NFC coil antenna (not shown) to beintegrated in a palm rest (not shown) or in other areas of the portabledevices 102. For example, the NFC coil antenna (not shown) may beintegrated underneath a metal chassis of portable device 102, or the NFCcoil antenna (not shown) may be integrated underneath conductive coatingof the portable device 102. In this example, the portable devices 102may accept information from a credit card 104 or NFC tag 106 through theNFC coil antenna (not shown).

FIG. 2A illustrates an example NFC coil antenna 200. In animplementation, the coil antenna 200 may include a continuous multipleloop of coil antenna that forms a rectangular ring shape. The continuousloop of coil antenna 200 may be mounted on, embedded in, or otherwiseassociated with a metallic chassis (not shown) or a conductive coating(not shown) of a plastic chassis device, such as portable device 102.The coil antenna 200 may include a dedicated antenna for NFC purposes.In other words, the coil antenna 200 may be configured to operate on aseparate resonant frequency (e.g., 13.56 MHz to implement NFCoperations), and independent from another antenna that uses standardfrequencies used in wireless communications (e.g., 5 GHz for WiFisignals). In another implementation, the coil antenna 200 may beutilized for the WiFi signals that operate at 2.4 GHz or 5 GHz operatingfrequencies. The coil antenna 200 may be made out of a printed circuitboard (PCB), a flexible printed circuit (FPC), a metal wire, createdthrough a laser direct structuring (LDS) process, or directly embeddedto the metallic chassis (not shown) and underneath a conductive coating(not shown) portable device 102.

FIG. 2B illustrates a top view of a keypad area 202 of the portabledevice 102. In an implementation, the present embodiment may include aunique pattern and design of the conductive coating (not shown) that isassociated with or located underneath chassis 204. In thisimplementation, the conductive coating may be associated with chassis204. Chassis 204 may be plastic, metal, carbon fiber or anothermaterial. For example, in a full metallic chassis, the unique patternand design may be implemented to extend from the conductive coating tothe chassis 204 itself. In a full metallic chassis 204, the uniquepattern and design may be implemented by providing slots in the metallicchassis 204. For plastic chassis 204, the unique pattern and design mayextend to the conductive coating alone. Although chassis 204 is shown asa rectangular region within the device 200, it may extend beyond what isdepicted in FIG. 2B. For instance, chassis 204 may encompasses the agreater portion or the entire device 200.

In an implementation, the unique pattern and design may includeconstruction of a fractal slot (not shown) that is based or modeled froma no-self loop fractal space filling curve template (i.e., fractal curvetemplate) such as Hilbert Curves (not shown). In this implementation,the fractal slot is constructed in the chassis 204 to allow the coilantenna 200 to perform NFC related functions or operate at WiFi signaloperating frequencies. Furthermore, the fractal slot is constructed tocover an area that includes approximate extent of electromagnetic fieldsthat induce Eddy current to the conductive coating.

In an implementation, an NFC module 206 may be integrated anywhereinside the keypad area 202 or in other areas such us, beside a trackpadarea 208. The NFC module 206 may include transceiver circuitry thatprocesses electrical signals in the coil antenna 200. For example, theNFC module 206 may be used to provide tuning to the coil antenna 200 formaximum power transfer during transmit or receive operations. In otherimplementations, the NFC module 206 may be integrated with the coilantenna 200 underneath the chassis 204 to form a single module.

FIG. 3 illustrates an underneath view of the coil antenna 200integration in the chassis 204. For example, the coil antenna 200 isplaced underneath the full metal chassis 204 that includes an integratedor associated conductive coating 300. In this example, the integrated orassociated conductive coating 300 is located between the coil antenna200 and the chassis 204. FIG. 3 shows upside down illustration of thisconfiguration (i.e., chassis 204 is placed at bottom, conductive coating300 at middle, and coil antenna 200 at top).

With continuing reference to FIG. 3, when a current 302 is injectedthrough the coil antenna 200, an electromagnetic field (not shown) maybe generated around the coil antenna 200. In an implementation, theelectromagnetic field may induce an Eddy current 304 in a conductivesurface 306 of the conductive coating 300. In this implementation, theEddy current 304 is flowing in opposite direction as against thedirection of the injected current 302. As a result, the Eddy current 304may generate a reactive magnetic field (not shown) that may partiallycancel the electromagnetic field generated by the coil antenna 200. Tothis end, the NFC performance of the coil antenna 200 is significantlyimpacted. In other words, such as in a full metal chassis 204, impedanceseen by the Eddy current 304 is approximately zero, and thus the inducedEddy current 304 magnitude is high. The higher the Eddy current 304, thelower NFC field strength is produced in the coil antenna 200.

FIG. 4A illustrates an example fractal curve that is used as a templatefor constructing a fractal slot (not shown) in conductive coating and/ormetallic chassis of the portable device 102. In an implementation, FIG.4A shows example orders in building a fractal curve 400 that isordinarily used to model highly complex or irregular objects. In currentimplementation, the object to be modeled is the rectangular coil antenna200 or the approximate extent of electromagnetic fields that may beradiated by the coil antenna 200. In an implementation, the fractalcurve 400 may include a continuous no-self loop fractal space fillingcurve (e.g., Hilbert Curve) to provide high impedance to the Eddycurrent 304. For example, the fractal curve 400 may provide a specialslot pattern or design template to minimize coupling between the coilantenna 200 and the conductive coating 300. In this example, the fractalcurve 400 template is adapted in constructing the fractal slot (notshown) in the conductive coating 300 and the chassis 204 to minimizepresence of the Eddy current 304.

With continuing reference to FIG. 4A, the special slot pattern or designmay include a (highly magnified) first order 400-2, a second order400-4, a third order 400-6 and an “n^(th)” order 400-n that is acontinuous no-self loop multiple variation of the first order 400-2. Inan implementation, the first order 400-2 may be defined as first order400-2=F*(P₀) where “F” is a transformation function and P₀ is an initialpoint such as X₀ and Y₀. In this implementation, a re-generation featureof the fractal curve 400 may provide higher order that is aself-similarity of the original first order 400-2. For example, thesecond order 400-4 may be defined as the second order 400-2=F*(F*P₀);the third order 400-6 may be defined as third order 400-6=F*(F*(F*P₀));and the n^(th) order 400-n may be defined as the n^(th) order400-n=F^(n)*P₀.

In an implementation, the n^(th) order 400-n may include an exampleconfiguration of the fractal slot (not shown) to provide high impedanceto the Eddy current 304. In this implementation, the configuration ofthe no-self loop n^(th) order 400-n itself may provide the highimpedance to the Eddy current 304. In another implementation, width 402of the no-self loop n^(th) order 400-n may be dynamically adjusted(e.g., 1 mm) to obtain the same result. In an implementation, the n^(th)order 400-n may be further re-generated or tiled with another n^(th)order 400-n fractal curve template (i.e., another fractal slot) to coverthe coil antenna 200. In other words, the fractal curve 400 may bedynamically adjusted from a lower order/smaller scale to a higherorder/higher scale when used to model the size of the coil antenna 200or at least the approximate extent of the electromagnetic field radiatedby the coil antenna 200.

FIG. 4B illustrates an example fractal slot that is tiled with anotherfractal slot to reduce coupling between the coil antenna 200 and theconductive coating 300. In an implementation, a fractal slot 404 mayinclude constructed slots, slices, or segments that adapt or are basedfrom the fractal curve 400 template. For example, a single fractal slot404 is configured to adapt the n^(th) order 400-n fractal curve 400template. In this example, the fractal slot 404 may include a no-selfloop fractal space filling curve shape that is constructed on theconductive coating 300 or the metal chassis 204.

In an implementation, fractal slot 404 may be constructed at eachquadrant (i.e., 1^(st), 2^(nd), 3^(rd), and 4^(th) quadrant) of an areacovered by the coil antenna 200 or the area defined by approximateextent of electromagnetic fields radiated by the coil antenna 200. Forexample a fractal slot 404-2 is constructed in the 1^(st) quadrant toprovide high impedance to the Eddy current 304 that may be present atleast in the first quadrant of area 204. In this example, fractal slots404-4 to 404-8 may be constructed in the 2^(nd), 3^(rd), and 4^(th)quadrant, respectively, to provide maximum impedance to the Eddy current304 that may be generated by the coil antenna 200.

In an implementation, the number of quadrants may provide correspondingnumber of grounding points 406 to maintain or increase ESD in theconductive coating 300, and also to provide rigidity of the constructedfractal slots 404 in the chassis 204. For example, ground points 406-2and 406-4, which includes both ends of the fractal slot 404-2, areinstalled to connect the fractal slot 404-2 in the first quadrant torest of the conducting coating 300. Similarly, ground points 406-6 and406-8 are used for the second fractal slot 404-4 in the second quadrant,ground points 406-10 and 406-12 are used for the third fractal slot404-6 in the 3^(rd) quadrant, etc. In these examples, the fractal slots404 may transform the conductive coating 300 into a transparentconductive coating 300 such that the integrated coil antenna 200 mayperform NFC related functions as if the conductive coating 300 is notpresent. In other words, the conductive coating 300 may include a lowcoupling coefficient such that the coil antenna 200 may be able to readthe credit card 104 or the NFC tag 106 without compromising ESDprotection for the conductive coating 300. For metal chassis 204, theslots 404 may be constructed to protrude from the conductive coating 300to the metallic chassis 204.

With continuing reference to FIG. 4B, the area covered by the fourquadrants may be equal to or greater than the area covered by outsideperimeter of the coil antenna 200. In other implementations, a singlefractal slot 404 may be used to cover the approximate extent ofelectromagnetic fields that may induce Eddy current 304 (see FIG. 3) tothe conductive coating 300 (see FIG. 3). In this implementation,frequency selectivity of the fractal slot 404 may be further configuredby adjusting the width 402, by adjusting the distance of the coilantenna 200 to the fractal slot 404, or by dynamically adjusting numberof fractal slots 404 to be tiled with another fractal slot 404.

FIG. 5 illustrates different fractal curve 400 templates used inconstructing the fractal slot 404. In an implementation, FIG. 5 showsno-self loop fractal curve 400 templates to be adapted by the fractalslot 404 that may be tiled with another fractal slot 404. For example, aPeano Curve 500 may be adapted by the single fractal slot 404 in each ofthe quadrants in FIG. 4B. Similarly, a Lebesque curve 502 of zero ordermay be re-generated to provide the template for the single fractal slot404. Furthermore, an H-tree curve 504 may be used as the template forconstructing single fractal slot 404.

FIG. 6 shows an example process chart 600 illustrating an example methodfor reducing induced currents in a wireless device chassis. The order inwhich the method is described is not intended to be construed as alimitation, and any number of the described method blocks can becombined in any order to implement the method, or alternate method.Additionally, individual blocks may be deleted from the method withoutdeparting from the spirit and scope of the subject matter describedherein. Furthermore, the method may be implemented in any suitablehardware, software, firmware, or a combination thereof, withoutdeparting from the scope of the invention.

At block 602, constructing a fractal slot to include a no-self loopfractal space filling curve shape is performed. In an implementation,the fractal slot (e.g., fractal slot 404) is provided (constructed) in acarbon-fiber or metallic chassis (e.g., chassis 204) of a portabledevice (e.g., portable device 102). In this implementation, the fractalslot 404 may be constructed in a conductive coating (e.g., conductivecoating 300) of a plastic chassis 204, or constructed in the conductivecoating 300 and extend up to full metal chassis 204 in case of Ultrabookdesign. In other words, the fractal slot 404 may protrude to surface ofthe full metal chassis 204.

In an implementation, the fractal slot 404 may adapt or is based from afractal curve template (e.g., fractal curve 400 template). In thisimplementation, the no-self loop fractal curve 400 may include differentorders such as a first order 400-2, a second order 400-4, . . . orn^(th) order 400-n. The (lower) first order 400-2 may include ageometric pattern defined by a transformation function and re-generatedto provide the (higher) n^(th) order 400-n. In other words, the fractalcurve 400 may include a self-similarity feature where the first order400-2 may include a smaller scale configuration of the higher ordern^(th) order 400-n.

In an implementation, the fractal slot 404 may be tiled with anotherfractal slot 404 e.g., placing first fractal slot 404-2 in 1^(st)quadrant, second fractal slot 404-4 to 2^(nd) quadrant, etc. to coverthe size of NFC coil antenna (e.g., coil antenna 200) or approximateextent of electromagnetic fields that may be radiated by the coilantenna 200. In other implementations, a single fractal slot 404 may beconfigured or designed to cover the coil antenna 200.

In an implementation, the fractal slot 404 may include grounding points(e.g., ground point 406) so as not to compromise ESD protection in theconductive coating 300 of the portable device 102. In thisimplementation, multiple ground points 406 may be installed in case ofmultiple fractal slots 404 that are tiled adjacent to each other tocover the approximate extent of electromagnetic fields generated by thecoil antenna 200.

At block 606, radiating the electromagnetic field by the coil antenna isperformed. In an implementation, the coil antenna 200 may be embeddeddirectly underneath the conductive coating 300. The conductive coating300 may be integrated to the chassis 204 of the portable device 102. Inan implementation, the coil antenna 200 may radiate the electromagneticfield during NFC related operations.

At block 608, providing high impedance to induced currents is performed.In an implementation, the fractal slot 404 may be configured to providethe high impedance for the induced currents (e.g., Eddy current 304).For example, the geometric pattern for the fractal slot 404 may beconfigured to minimize coupling between the coil antenna 200 and theconductive coating 300. In this example, the coupling minimization mayprovide the high impedance to the Eddy current 304 and as such,increases field strength of the coil antenna 200. Furthermore, fractalslot 404 width (e.g., width 402) may be adjusted to provide the highimpedance. In other implementations, the fractal slot 404 may beconfigured to be frequency selective through adjustment of the width402, dynamic adjustment of the transformation function that defines thegeometric pattern, or adjustment of distance between the coil antennaand the fractal slot 404.

Realizations in accordance with the present invention have beendescribed in the context of particular embodiments. These embodimentsare meant to be illustrative and not limiting. Many variations,modifications, additions, and improvements are possible. Accordingly,plural instances may be provided for components described herein as asingle instance. Boundaries between various components, operations anddata stores are somewhat arbitrary, and particular operations areillustrated in the context of specific illustrative configurations.Other allocations of functionality are envisioned and may fall withinthe scope of claims that follow. Finally, structures and functionalitypresented as discrete components in the various configurations may beimplemented as a combined structure or component. These and othervariations, modifications, additions, and improvements may fall withinthe scope of the invention as defined in the claims that follow.

FIG. 7 illustrates an example system 700 in accordance with the presentdisclosure. In various implementations, system 700 may be a media systemalthough system 700 is not limited to this context. For example, system700 may be incorporated into a personal computer (PC), laptop computer,ultra-laptop computer, tablet, touch pad, portable computer, handheldcomputer, palmtop computer, personal digital assistant (PDA), cellulartelephone, combination cellular telephone/PDA, television, smart device(e.g., smart phone, smart tablet or smart television), mobile internetdevice (MID), messaging device, data communication device, and so forth.

In various implementations, system 700 includes a platform 702 coupledto a display 720. Platform 702 may receive content from a content devicesuch as content services device(s) 730 or content delivery device(s) 740or other similar content sources. A navigation controller 750 includingone or more navigation features may be used to interact with, forexample, platform 702 and/or display 720. Each of these components isdescribed in greater detail below.

In various implementations, platform 702 may include any combination ofa chipset 705, processor 710, memory 712, storage 714, graphicssubsystem 715, applications 716 and/or radio 718. Chipset 705 mayprovide intercommunication among processor 710, memory 712, storage 714,graphics subsystem 715, applications 716 and/or radio 718. For example,chipset 705 may include a storage adapter (not depicted) capable ofproviding intercommunication with storage 714.

Processor 710 may be implemented as a Complex Instruction Set Computer(CISC) or Reduced Instruction Set Computer (RISC) processors, x86instruction set compatible processors, multi-core, or any othermicroprocessor or central processing unit (CPU). In variousimplementations, processor 710 may be dual-core processor(s), dual-coremobile processor(s), and so forth.

Memory 712 may be implemented as a volatile memory device such as, butnot limited to, a Random Access Memory (RAM), Dynamic Random AccessMemory (DRAM), or Static RAM (SRAM).

Storage 714 may be implemented as a non-volatile storage device such as,but not limited to, a magnetic disk drive, optical disk drive, tapedrive, an internal storage device, an attached storage device, flashmemory, battery backed-up SDRAM (synchronous DRAM), and/or a networkaccessible storage device. In various implementations, storage 714 mayinclude technology to increase the storage performance enhancedprotection for valuable digital media when multiple hard drives areincluded, for example.

Graphics subsystem 715 may perform processing of images such as still orvideo for display. Graphics subsystem 715 may be a graphics processingunit (GPU) or a visual processing unit (VPU), for example. An analog ordigital interface may be used to communicatively couple graphicssubsystem 715 and display 720. For example, the interface may be any ofa High-Definition Multimedia Interface, DisplayPort, wireless HDMI,and/or wireless HD compliant techniques. Graphics subsystem 715 may beintegrated into processor 710 or chipset 705. In some implementations,graphics subsystem 715 may be a stand-alone card communicatively coupledto chipset 705.

The graphics and/or video processing techniques described herein may beimplemented in various hardware architectures. For example, graphicsand/or video functionality may be integrated within a chipset.Alternatively, a discrete graphics and/or video processor may be used.As still another implementation, the graphics and/or video functions maybe provided by a general purpose processor, including a multi-coreprocessor. In further embodiments, the functions may be implemented in aconsumer electronics device.

Radio 718 may include one or more radios capable of transmitting andreceiving signals using various suitable wireless communicationstechniques. Such techniques may involve communications across one ormore wireless networks. Example wireless networks include (but are notlimited to) wireless local area networks (WLANs), wireless personal areanetworks (WPANs), wireless metropolitan area network (WMANs), cellularnetworks, and satellite networks. In communicating across such networks,radio 718 may operate in accordance with one or more applicablestandards in any version.

In various implementations, display 720 may include any television typemonitor or display. Display 720 may include, for example, a computerdisplay screen, touch screen display, video monitor, television-likedevice, and/or a television. Display 720 may be digital and/or analog.In various implementations, display 720 may be a holographic display.Also, display 720 may be a transparent surface that may receive a visualprojection. Such projections may convey various forms of information,images, and/or objects. For example, such projections may be a visualoverlay for a mobile augmented reality (MAR) application. Under thecontrol of one or more software applications 716, platform 702 maydisplay user interface 722 on display 720.

In various implementations, content services device(s) 730 may be hostedby any national, international and/or independent service and thusaccessible to platform 702 via the Internet, for example. Contentservices device(s) 730 may be coupled to platform 702 and/or to display720. Platform 702 and/or content services device(s) 730 may be coupledto a network 760 to communicate (e.g., send and/or receive) mediainformation to and from network 760. Content delivery device(s) 740 alsomay be coupled to platform 702 and/or to display 720.

In various implementations, content services device(s) 730 may include acable television box, personal computer, network, telephone, Internetenabled devices or appliance capable of delivering digital informationand/or content, and any other similar device capable of unidirectionallyor bidirectionally communicating content between content providers andplatform 702 and/display 720, via network 760 or directly. It will beappreciated that the content may be communicated unidirectionally and/orbidirectionally to and from any one of the components in system 700 anda content provider via network 760. Examples of content may include anymedia information including, for example, video, music, medical andgaming information, and so forth.

Content services device(s) 730 may receive content such as cabletelevision programming including media information, digital information,and/or other content. Examples of content providers may include anycable or satellite television or radio or Internet content providers.The provided examples are not meant to limit implementations inaccordance with the present disclosure in any way.

In various implementations, platform 702 may receive control signalsfrom navigation controller 750 having one or more navigation features.The navigation features of controller 750 may be used to interact withuser interface 722, for example. In embodiments, navigation controller750 may be a pointing device that may be a computer hardware component(specifically, a human interface device) that allows a user to inputspatial (e.g., continuous and multi-dimensional) data into a computer.Many systems such as graphical user interfaces (GUI), and televisionsand monitors allow the user to control and provide data to the computeror television using physical gestures.

Movements of the navigation features of controller 750 may be replicatedon a display (e.g., display 720) by movements of a pointer, cursor,focus ring, or other visual indicators displayed on the display. Forexample, under the control of software applications 716, the navigationfeatures located on navigation controller 750 may be mapped to virtualnavigation features displayed on user interface 722, for example. Inembodiments, controller 750 may not be a separate component but may beintegrated into platform 702 and/or display 720. The present disclosure,however, is not limited to the elements or in the context shown ordescribed herein.

In various implementations, drivers (not shown) may include technologyto enable users to instantly turn on and off platform 702 like atelevision with the touch of a button after initial boot-up, whenenabled, for example. Program logic may allow platform 702 to streamcontent to media adaptors or other content services device(s) 730 orcontent delivery device(s) 740 even when the platform is turned “off.”In addition, chipset 705 may include hardware and/or software supportfor 5.1 surround sound audio and/or high definition 7.1 surround soundaudio, for example. Drivers may include a graphics driver for integratedgraphics platforms. In embodiments, the graphics driver may comprise aperipheral component interconnect (PCI) Express graphics card.

In various implementations, any one or more of the components shown insystem 700 may be integrated. For example, platform 702 and contentservices device(s) 730 may be integrated, or platform 702 and contentdelivery device(s) 740 may be integrated, or platform 702, contentservices device(s) 730, and content delivery device(s) 740 may beintegrated, for example. In various embodiments, platform 702 anddisplay 720 may be an integrated unit. Display 720 and content servicedevice(s) 730 may be integrated, or display 720 and content deliverydevice(s) 740 may be integrated, for example. These examples are notmeant to limit the present disclosure.

In various embodiments, system 700 may be implemented as a wirelesssystem, a wired system, or a combination of both. When implemented as awireless system, system 700 may include components and interfacessuitable for communicating over a wireless shared media, such as one ormore antennas, transmitters, receivers, transceivers, amplifiers,filters, control logic, and so forth. An example of wireless sharedmedia may include portions of a wireless spectrum, such as the RFspectrum and so forth. When implemented as a wired system, system 700may include components and interfaces suitable for communicating overwired communications media, such as input/output (I/O) adapters,physical connectors to connect the I/O adapter with a correspondingwired communications medium, a network interface card (NIC), disccontroller, video controller, audio controller, and the like. Examplesof wired communications media may include a wire, cable, metal leads,printed circuit board (PCB), backplane, switch fabric, semiconductormaterial, twisted-pair wire, co-axial cable, fiber optics, and so forth.

Platform 702 may establish one or more logical or physical channels tocommunicate information. The information may include media informationand control information. Media information may refer to any datarepresenting content meant for a user. Examples of content may include,for example, data from a voice conversation, videoconference, streamingvideo, electronic mail (“email”) message, voice mail message,alphanumeric symbols, graphics, image, video, text and so forth. Datafrom a voice conversation may be, for example, speech information,silence periods, background noise, comfort noise, tones and so forth.Control information may refer to any data representing commands,instructions or control words meant for an automated system. Forexample, control information may be used to route media informationthrough a system, or instruct a node to process the media information ina predetermined manner. The embodiments, however, are not limited to theelements or in the context shown or described in FIG. 7.

As described above, system 700 may be embodied in varying physicalstyles or form factors. FIG. 7 illustrates implementations of a smallform factor device 700 in which system 700 may be embodied. Inembodiments, for example, device 700 may be implemented as a mobilecomputing device having wireless capabilities. A mobile computing devicemay refer to any device having a processing system and a mobile powersource or supply, such as one or more batteries, for example.

As described above, examples of a mobile computing device may include apersonal computer (PC), laptop computer, ultra-laptop computer, tablet,touch pad, portable computer, handheld computer, palmtop computer,personal digital assistant (PDA), cellular telephone, combinationcellular telephone/PDA, television, smart device (e.g., smart phone,smart tablet or smart television), mobile internet device (MID),messaging device, data communication device, and so forth.

Examples of a mobile computing device also may include computers thatare arranged to be worn by a person, such as a wrist computer, fingercomputer, ring computer, eyeglass computer, belt-clip computer, arm-bandcomputer, shoe computers, clothing computers, and other wearablecomputers. In various embodiments, for example, a mobile computingdevice may be implemented as a smart phone capable of executing computerapplications, as well as voice communications and/or datacommunications. Although some embodiments may be described with a mobilecomputing device implemented as a smart phone by way of example, it maybe appreciated that other embodiments may be implemented using otherwireless mobile computing devices as well. The embodiments are notlimited in this context.

As shown in FIG. 8, device 800 may include a housing 802 (i.e., chassis204), a display 804, an input/output (I/O) device 806, and an antenna808. Device 800 also may include navigation features 810. Display 804may include any suitable display unit for displaying informationappropriate for a mobile computing device. I/O device 806 may includeany suitable I/O device for entering information into a mobile computingdevice. Examples for I/O device 806 may include an alphanumerickeyboard, a numeric keypad, a touch pad, input keys, buttons, switches,rocker switches, microphones, speakers, voice recognition device andsoftware, and so forth. Information also may be entered into device 800by way of microphone (not shown). Such information may be digitized by avoice recognition device (not shown). The embodiments are not limited inthis context.

Various embodiments may be implemented using hardware elements, softwareelements, or a combination of both. Examples of hardware elements mayinclude processors, microprocessors, circuits, circuit elements (e.g.,transistors, resistors, capacitors, inductors, and so forth), integratedcircuits, application specific integrated circuits (ASIC), programmablelogic devices (PLD), digital signal processors (DSP), field programmablegate array (FPGA), logic gates, registers, semiconductor device, chips,microchips, chip sets, and so forth. Examples of software may includesoftware components, programs, applications, computer programs,application programs, system programs, machine programs, operatingsystem software, middleware, firmware, software modules, routines,subroutines, functions, methods, procedures, software interfaces,application program interfaces (API), instruction sets, computing code,computer code, code segments, computer code segments, words, values,symbols, or any combination thereof. Determining whether an embodimentis implemented using hardware elements and/or software elements may varyin accordance with any number of factors, such as desired computationalrate, power levels, heat tolerances, processing cycle budget, input datarates, output data rates, memory resources, data bus speeds and otherdesign or performance constraints.

One or more aspects of at least one embodiment may be implemented byrepresentative instructions stored on a machine-readable medium whichrepresents various logic within the processor, which when read by amachine causes the machine to fabricate logic to perform the techniquesdescribed herein. Such representations, known as “IP cores” may bestored on a tangible, machine readable medium and supplied to variouscustomers or manufacturing facilities to load into the fabricationmachines that actually make the logic or processor.

While certain features set forth herein have been described withreference to various implementations, this description is not intendedto be construed in a limiting sense. Hence, various modifications of theimplementations described herein, as well as other implementations,which are apparent to persons skilled in the art to which the presentdisclosure pertains are deemed to lie within the spirit and scope of thepresent disclosure.

Realizations in accordance with the present invention have beendescribed in the context of particular embodiments. These embodimentsare meant to be illustrative and not limiting. Many variations,modifications, additions, and improvements are possible. Accordingly,plural instances may be provided for components described herein as asingle instance. Boundaries between various components, operations anddata stores are somewhat arbitrary, and particular operations areillustrated in the context of specific illustrative configurations.Other allocations of functionality are envisioned and may fall withinthe scope of claims that follow. Finally, structures and functionalitypresented as discrete components in the various configurations may beimplemented as a combined structure or component. These and othervariations, modifications, additions, and improvements may fall withinthe scope of the invention as defined in the claims that follow.

What is claimed is:
 1. An apparatus comprising: one or more processors;a memory coupled to the one or more processors; a near fieldcommunications (NFC) antenna coupled to the one or more processorswherein the NFC antenna includes a continuous multiple loop of coil thatis integrated underneath a metal chassis of the apparatus; and aconductive coating that is disposed in between the NFC antenna and themetal chassis, wherein at least one continuous fractal slot isconstructed on the conductive coating and the metal chassis, wherein adirection of sliced slots or segments of the at least one continuousfractal slot is configured to be perpendicular to an assumed directionof an induced current on the conductive coating, wherein the assumeddirection of the induced current on the conductive coating is oppositeto a direction of an injected current on the continuous multiple loop ofcoil of the NFC antenna.
 2. The apparatus as recited in claim 1, whereinthe at least one continuous fractal slot defines an area that covers atleast a perimeter of an outermost coil of the continuous multiple loopcoil of the NFC antenna.
 3. The apparatus as recited in claim 1, whereinthe at least one continuous fractal slot is a no-self loop fractal spacefilling curve template that includes a Hilbert Curve, a Peano Curve, aLebesque Curve, or an H-tree curve.
 4. The apparatus as recited in claim1, wherein the continuous multiple loop of coil forms a rectangular ringshaped—NFC antenna.
 5. The apparatus as recited in claim 4, wherein theassumed direction of the induced current on the conductive coatingfollows a pattern of the continuous multiple loop of coil of therectangular ring shape—NFC antenna.
 6. The apparatus as recited in claim1, wherein the sliced slots or segments form a geometric patternconfigured to cut continuity of the induced current on the conductivecoating.
 7. The apparatus as recited in claim 1, wherein the continuousfractal slot is tiled into different quadrants of an area covering anapproximate extent of electromagnetic fields that induce Eddy current tothe conductive coating.
 8. The apparatus as recited in claim 1, whereinthe at least one continuous fractal slot includes an adjustable width toprovide high impedance to Eddy current and frequency selectivity whenthe NFC antenna is operating in wireless fidelity (WiFi) signalfrequency.
 9. A method of reducing induced currents in an apparatuschassis comprising: constructing a fractal slot on a conductive coatingand the apparatus chassis, wherein a direction of sliced slots orsegments of the fractal slot is configured to be perpendicular to anassumed direction of an induced current on the conductive coating,wherein the assumed direction of the induced current on the conductivecoating is opposite to a direction of an injected current on acontinuous multiple loop of coil of an near field communications (NFC)antenna, wherein the conductive coating is disposed in between the NFCantenna and the apparatus chassis; radiating an electromagnetic field bythe NFC antenna; and providing high impedance to the currents induced bythe electromagnetic field.
 10. The method in claim 9, wherein the slicedslots or segments of the fractal slot is constructed on a metallicchassis or carbon-fiber chassis.
 11. The method in claim 9, wherein thefractal slot defines an area that covers at least a perimeter of anoutermost coil of the continuous multiple loop coil of the NFC antenna.12. The method in claim 9, wherein the sliced slots or segments form ageometric pattern configured to cut continuity of the induced current onthe conductive coating.
 13. The method in claim 9, wherein the slicedslots or segments of the fractal slot include an adjustable width toprovide a high impedance to the induced currents and to providefrequency selectivity when the NFC antenna is operating in a wirelessfidelity (WiFi) signal frequency.
 14. The method in claim 9, wherein thecontinuous multiple loop of coil forms a rectangular ring shaped—NFCantenna.
 15. The method in claim 14, wherein the assumed direction ofthe induced current on the conductive coating follows a pattern of thecontinuous multiple loop of coil of the rectangular ring shape—NFCantenna.
 16. The method in claim 9, wherein the fractal slot is tiledwith another fractal slot to cover an area that includes approximateextent of an electromagnetic field that induces Eddy current to theconductive coating.
 17. The method in claim 9, wherein the fractal slotis a no-self loop fractal space filling curve shape that includes aHilbert Curve, a Peano Curve, a Lebesque Curve, or an H-tree curve. 18.The method in claim 9, wherein the induced current is an Eddy currentthat flows in opposite direction to the injected current in the NFCantenna.